59 



quaternary plates in the different distal series varies from 

 nine to twelve. There are, therefore, twelve arms to each ray 

 or sixty arms in this species 



The regular mterradial areas are of unequal size, some have 

 only two longitudinal series of plates and others have 

 three. The plates vary in number, in the different areas, from 

 eleven to eighteen, An area having only eleven plates is 

 shown in figure 3 and one having eighteen plates is shown in 

 figure 2. The intersecondary areas are elongated and have 

 from six to nine plates. The intertertiary areas are elongated 

 and have either three or four plates, one following the other. 

 In the azygous area two large plates truncate a subradial, and 

 they are followed by two large plates, and above these, there 

 are three or four plates in a range until the area begins to 

 contract. The superior part of this area is injured in our 

 specimen so that the exact number of plates it contains cannot 

 be determined. 



This species resembles F. multibrachiaius, in the structure of 

 the arms, as far as the tertiary radials, but above that, there 

 is considerable difference. The interradial areas differ in form 

 and in the number of plates and the azygous areas are widely 

 different. It, however, bears a closer relationship with that 

 species than with any other. The difference in the interradial 

 and azygous areas also makes the two species differ in the 

 form of the calyx. 



Pound by the late Prof. Wm. McAdams, in the Warsaw 

 Group, in Jersey county, Illinois, and now in the collection of 

 Wm. P. E. Gurley. 



TAXOCRINUS UNGULA, n. sp. 



Plate V, Fig. 1, azygous view; Fig. 2, opposite side of the same 



specimen. 



Species large and the arms have a fanciful resemblance to 

 numerous claws. The radial series stand out from the inter- 

 radial areas, and are regularly rounded. The interradial areas 

 are much depressed, and do not extend half the length of the 

 body, including the arms. There are one hundred arms in- 

 folded at the summit. The middle part of each plate overlaps 

 the inferior plate externally, in a sinuous line, as in other 

 species. Surface coarsely granular. Column very large, and 

 tapers rapidly below the calyx, where it is composed of very 

 thin plates. 



